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She counts as dutiful and competent character. But only outside her interest in Mikoto, which is (I assume on purpose) depicted as obsessive, clingy, and immature. Her exaggerated antics I could attribute to her deliberately blowing it out of proportion to make Misaka not consider her seriously as a suitor (and seriously reject her), but such complex twist is out of scope for Index writer. And because it would imply that Kuroko's affection is genuine actual love, which, I think, is not in author's plans.

She counts as dutiful and competent character. But only outside her interest in Mikoto, which is (I assume on purpose) depicted as obsessive, clingy, and immature. Her exaggerated antics I could attribute to her deliberately blowing it out of proportion to make Misaka not consider her seriously as a suitor (and seriously reject her), but such complex twist is out of scope for Index writer. And because it would imply that Kuroko's affection is genuine actual love, which, I think, is not in author's plans.

Check the manga and check the novels vol. 8.

What the anime did was to exagerate her antics and make them repetitive.

Woah! I wake up and suddenly I have a false sense of popularity.
Since the doujin only resides on exhentai at the moment and has a colossal size (wtf, 211Mb for 30 pages), I'll upload a resized version later (after my work) and spread it around.